Driving and stopping mechanism



R. H. LAWSON DRIVING AND STOPE ING MECHANISM Feb. 5 1924.

Original Filed Odt. 18, 1918 2 Sheets-Sheet 1 R. H. LAWSON DRIVING ANDSTOPPING MECHANISM Feb. 5 1924,

0%?1'181 Filed Oct. 18, 1918 2 Sheets-Sheet 2 fay Patented rss. 5, 192a.

MACHINERY CORPORATION, OF PATERSON,

NEW JERSEY.

ATENT oFFics.

ROBERT H. LAWSON, OF BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE NEWJERSEY, A CORPORATION OF DRIVING AND STOPPINGQHECHAHISM.

Original application filed October 18, 1918, Serial No. 258,677. Dividedand this application filed February 7, 1919.

To a whom it may concern.

Be it known that I, Ronnn'r H. LAWSON, a citizen of the United States,residing at Beverly, in the county of Essex and State of Massachusetts,have invented certain new and useful Improvements in Driving andStopping Mechanisms; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to driving and stopping mechanisms adapted forusejin high speed machines.

The preferred embodiment of the inventionis of the type employing highand low speed driving mechanisms, the high speed mechanism being inoperation during the normal operation of the machine, and the low speedmechanism being thrown in shortly before the machine is stopped andacting first to reduce the speed of the machine and then to drive themachine at a low speed to stopping position. This embodiment of theinvention is especially applicable to a shoe sewing machine of the typedisclosed in applicants pending appli' cation Serial No. 258,677, filedOctober 18, 1918, of which the present application constitutes adivision.

One of the objects of the invention is to provide a novel and improveddriving and stopping mechanism of the type described, which isrelatively simple in construction and highly efficient in operation.

The features of the invention consist in certain constructions,combinations and ar taken on the line 33 of Fig. 1; Fig. 1 is a detailsectional view, partly in elevation of a control rod for the drivingIllGCllitIlJSIDS-- Serial No. 275,616.

In the drawings the invention is shown embodied in a mechanism fordriving and stopping a shaft 2 from which the operating parts of amachine may be driven. The mechanism for driving the shaft during thenormal operation of the machine comprises a constantly driven pulley 4,loosely mounted on the shaft, which is adapted to be clutched to theshaft by the toward the clutch member through a sleeve 11 mounted toslideon the shaft and inter posed between the outer end of the hub ofthe pulley and a washer 16 secured to the left (viewing Fig. 1), thepulley is shifted end of the control rod. When the control rod isshifted to the right the pulley 4- is shifted from. the clutch member bymeans of a collar 18, secured to the control rod, which engages theinner end of the hub of the pulley. The collar 18 is secured to thecontrol rod by a pin 20 that extends through slots in the shaft. Thecontrol rod is actuated by means ofa bell crank lever 22 pivoted on theframe of the machine and connected to the rod by rolls 24 mounted onarms 26 of the bell crank lever, which rolls engage an annular groove ina collar 28 which is secured tothe rod by means of a} pin 30 thatextends through slots in the sia t.

A treadle rod 32 is pivotally connected to the arm 34 of the bell cranklever andwhen this rod is depressed, which may be accomplished by meansof a treadle mechanism (not shown) at the base of the machine, the

control rod through the bell crank lever is shifted in a direction toengage the pulley 4 with the clutch member 10. At the start of thismovement of the bell crank lever, and before the clutch faces on thepulley 1 and the clutch member 10 become engaged, a i

stop roll 36 is shifted out of engagement with a stop disk 38 carried bythe shaft.

The roll 86 is mounted on the upper end of a stop arm 40, the lower endof which is mounted to slide on a shaft or red 42 supported by a bracket44 on the fram of the machine. The stop arm is connected to the bellcrank lever by means of a link 46, hav- 1 treadle rod, through the bellcrank lever 22,

shifts the control rod to disengage the clutch faces of the pulley 4 andthe clutch member 10. Such movement of the treadle rod is limited by theengagement of the underside of one end of a bar 52 with a stud 54. The

other end of the bar 52 is pivoted on the treadlerod, and the bar iscentrally mounted to slide on a block 56 that is pivoted on the arm 26of the bell crank lever and extends through a slot in the bar. The rollon the stop arm is maintained out of engagement with the stop disk 38when the treadle is released, by the engagement of a latch 58 with astud 60, the latch 58 being pivoted on the hub of the arm 40 and thestud 60 being secured to the bracket 44. During the normal operation ofthe machine this latch is po-- sitioned sufiiciently back of the stud 60to permit a. slight movement of the treadle rod to vary the degree offrictional contact between the clutch faces on thepulley 4 and theclutch member 10, and thereby vary the speed of the shaft 2.

The pulley 4 is adapted to drive the machine at a high speed and inorder to stop the machine in a uniformly reliable manner without undueshock or wear on the parts thereof,a low speed mechanism is thrown in ata predetermined point in the rotation of the shaft after the pulley 4 isthrown out. This low speed mechanism acts first to reduce the speed ofthe machine and then to drive the machine at a low speed. After the lowspeed mechanism is in operation for a predetermined interval it isthrown out and stopping devices comprising the stop arm 40 and the stopdisk 38 are rendered active to stop the machinewith the shaft 2 in apredetermined angular position.

The low speed mechanism comprises a constantly driven pulley 62, looselymounted on, the shaft 2. which is adapted to be clutched to the shaft bythe engagement of a clutch face 64 on the interior thereof with aclutchface 66 on the clutch member 10. The pulley 62 is movable towardand from the clutch member to engage and disengage the clutch faces bymeans of the control rod 12. hen the control rod is shifted to theright, (viewing Fig. 1.) this pulley is moved toward the clutch memberthrough the engagement of the collar 28 with the end of an elongatedsleeve or hub 68 of the pulley. When the control rod is shifted to theleft,

the pulley is moved from the clutch member through the engagement of acollar 70 secured to the rod with the inner end of the hub of thepulley. The collar 7 0 is secured to the rod by a pin 7 2 which extendsthrough slots in the shaft.

The limited movement of the control rod to throw out the pulley 4, whenthe treadlc rod is released, is not sufiicient to bring the pulley 62into engagement with the clutch member. The additional movement requiredto be imparted to the control rod to throw in the pulley 62 at apredetermined point in the rotation of the shaft is accomplished bymeans of a grooved cam 74 carried by the shaft. This cam imparts aconstant oscillating movement to lever 76 having its lower end pivotedon the frame of the machine. The upper end of this lever carries thestud 54 which, at a predetermined point, in the rotationof the shaft,engages a notch 7 8 in the end of the bar 52, whereupon the barisshifted to the right which, through the bell crank lever 22, shiftsthe low speed pulley into engagement with the clutch member 10. In orderto insure the proper engagement of the pulley 62 with the clutch member10, the pulley is yieldingly brought into engagement with the clutchmember. To this end, the actuation of the bell crank lever by the bar 52to throw in the pulley 62, is accomplished through a. spring 84interposed between the pivoted block 56 and the end of the slot in thebar. This movement of the bell crank lever, shifts the link 46 to causea pin thereon to engage a member of the latch 58 and thereby disengagethe latch from the stud 60, which permits a spring 82, having one endconnected to the hub of the stop arm 40 and its other end secured to theframe of the machine, to bring the roll on the stop arm into engagementwith a side of the stop disk 38. In order to permit the link 46 to bethus shifted independently of the stop arm 40, the link is provided witha slot 86 through which the pin 48 extends.

At the completion of a predetermined number of degrees of rotation ofthe shaft 2 after the low speed pulley is thrown in, the cam 74 actsthrough the oscillating lever 76 and bar 52 to rock the bell crank lever22 in a direction to disengage the low speed pulley from the clutchmember, at which time recess 88 in the stop disk 38 is brought intoregistry with the stop roll 36 which permits the spring 82 to carry thestop roll into the recess, and by the engagement of the roll with thewalls of the recess finally stop the machine in a predeterminedposition. In order to ensure that the engagement of the the treadle rod32 is allowed to rise.

stop roll 36 with the recess in the stop disk shall not effect thestoppage of the shaft too abruptly, the walls of the recess are inclinedoutwardly (Fig. 8) the stop arm 40 1s pivtally mounted on the rod 42,and the roll is urged toward the bottom of the recess in the stop. diskby a. coiled spring 90 having one end secured to the arm and its other.end secured to the machine frame. This construction permits a certainamount of oscillating movement of the shaft 2 before the stop roll isfinally seated in the bottom of the recess and the shaft is finallystopped.

The operation of the mechanism illustrated in the drawings has beenindicated in connection with the. description of the construction, butmay be briefly stated as follows: lVith the parts at rest, as in.-dicated in Fig. 2, both the high speed pulley l and the low speed pulley62 are out of engagement with the clutch member 10. The notch 78 of thebar 52 isin engagement with the stud 54 and the roll 36 of the stop armis in the recess 88 of the stop disk 38. A depression of the treadle rod32 raises the bar .52 from engagement with the stud 54 and rocks thebell crank 22 in a direction to move the high speed pulley 4 intoengagement with the clutch member 10. Before the pulley engages theclutch member the stop arm 40 is moved to the left as viewed in Fig. 2so as to remove the roll 36 from the path of the cam disk 38. Thismovement of the stop arm 40 to the left I carries the latch 58 slightlybeyond the stud 60. The shaft -2 is now driven at high speed through thepulley 4i and. clutch member 10. When the shaft 2 is to be stopped Thisrocks the bell crank lever 22 in a direction to move the high speedpulley 4 away from p the clutch member 10 and the low speed pulley 62towards the clutch member 1(7. Before the low speed pulley engages theclutch member the bar 52 engages the stud 54. This stops the movement ofthe slow speed pulley towards the clutch member. During this movement ofthe bell crank lever 22 the latch 58 engages the stud 60 and during thecontinued movement of the bell crank lever and link 46 the stop arm isheld out of the path of movement of the disk 38, the continued movementof the link 46 being permitted by the slot 86. with which the pin 48engages The parts remain in this position until the lever 76 is moved toa position in which the notch 78 in the bar 52 can engage the stud 54.Continued movement of the lever 76 moves the bar 52 to the right andthrough the spring 84 and block 56 moves the bell crank 22 in adirection to engage the slow speed pulley with the clutch member. Thismovement of the bell crank lever 22 through the link 46 and pin 80raises the latch 58 and permits the spring 82 to move the stop levertowards the stop cam 38, the roll 36 bearing against the slow speedpulley until the lever 76 is actuated to move the bell crank lever 22 soas to return the high and low speed pulleys to the position indicated inFig. 1, in which position both pulleys are out of engagement with theclutch member 1O. At this point in the revolution of the shaft 2 therecess 88 in the stop disk registerswith the roll 36 and the roll movesinto the recess, thereby stopping the rotation of the shaft.

While it is preferred to employ the specific construction andarrangement of parts shown and described, it will be understood thatthis construction and arrangement is not essential except so far asspecified in the appended claims.

The nature and scope of the invention having been indicated and amechanism embodying the several features of the invention having beenspecifically described, what is claimed is 1. A driving and stoppingmechanism having, in combination, a shaft, a high speed drivingmechanism therefor, a low speed driving mechanism therefor, means underthe control of the operator for throwing out the high speed mechanism,and means for throwing in the low speed mechanism at a predeterminedpoint in the rotation of the shaft after the high speed mechanism isthrown out and for thereafter throwing out the low speed mechanism andstopping the shaft at a predetermined point in the rota tion thereof,said means including an oscillating lever, the movement of which in one.

direction effects said throwing in of the low speed mechanism.

2. A driving and stopping mechanism having, in combination, a shaft, ahigh speed driving mechanism therefor, a low speed driving mechanismtherefor, means under thecontrol of the operator for throwing out thehighspeed mechanism, an oscillating lever, means for actuatingthe lever,and means actuated by movement of the lever in one direction forthrowing in the low speed mechanism after the high speed mechanismisthrown out, and actuated by movement of the lever in the oppositedirection for throwing out the low speed mecha nism at the completion ofa predetermined interval of operation thereof.

3. A driving and stopping mechanism having, in combination, a shaft, ahigh speed driving mechanism therefor, a low speed driving mechanismtherefor, means under the control of the operator for throwing out thehigh'speed mechanism, and means for throwing in the low speed mechanismafter the high speed mechanism is thrown out and for thereafter throwingout the low speed mechanism and stopping the shaft at a predeterminedpoint in the rotation thereof, said means including an oscillatingmemher, the movement of which in one direction effectssaid throwing inof the low speed mechanism and a cam for actuating said oscillatingmember.

4. A driving and stopping nechanism having, in combination, a shaft, ahigh speed driving mechanism therefor, a low speed driving mechanismtherefor, means under the control of the operator for throwing out thehighspeed mechanism, an oscillating member, a cam for actuating theoscillating member, and means actuated by movement of the oscillatingmember in one direction for throwing in the low speed mechanism afterthe high speed mechanism is thrown out, and actuated by movement of theoscillating member in the opposite direction for throwing out the lowspeed mechanism at the completion of a predetermined interval ofoperation thereof.

5. A driving and stopping mechanism having, in combination, a shaft, ahigh speed driving mechanism therefor, a low speed driving mechanismtherefor, means under the control of the operator for throwing out thehigh speed mechanism, and means for throwing in the low speed mechanismat a predetermined point in the rotation of the shaft after the highspeed mechanism is thrown out and for throwing out the lowspeedmechanism at the completion of a predetermined interval ofoperation thereof, said means including an oscillating nember, themovementof which in one direction effects said throwing out of the lowspeed mechanism. I v

6. A driving and stopping mechanism having, in combination, a shaft, ahigh speed driving mechanism therefor, a low speed driving mechanismtherefor, means under the control of the operator for throwing out thehigh speed mechanism, and means for throwing in the low speed mechanismafter the high speed mechanismis thrown out and for tin-owing out thelow speed mechanism at the completion of a predetermined interval ofoperation thereof, said means in cluding a cam fixed against movementlongitudinally of the shaft and a lever oscillated by the cam whichcooperate to control said throwing in of the low speed mechanism.

7. A driving and sto ping mechanism having, in combination, a s iaft, ahigh speed driving mechanism therefor, a low speed driving mechanismtherefor, means under the control of the operator for throwing out thehigh speed mechanism, and means for throwing in the low speed mechanismat a predetermined point in the rotation of the shaft after the highspeed mechanism is thrown out and for thereafter throwing out the lowspeed mechanism, said means ineluding a cam fixed against movementlongitudinally of the shaft and a lever oscillated by the cam whichcooperate to control the throwing out of the low speed mechanism.

8. A driving and stopping mechanism having, in combination, a shaft, ahigh speed driving mechanism therefor, a low speed driving mechanismtherefor, and means under the control of the operator for throwing thehigh'speed mechanism out of operation andthrowing the low speedmechanism into and out of operation, said means including an oscillatingmember which is connected to a member of the low speed mechanism whenthe high speed mechanism is thrown out, wherebythe movement of theoscillating member in one direction acts to shift said member of the lowspeed mechanism and thereby throw in the low speed mechanism.

9. A driving and stopping mechanism having, in combination, a shaft, ahigh speed driving mechanism therefor, a low saeed driving mechanismtherefor, and means under the control of the operator for throwing thehigh speed mechanism out of operation and for throwing the low speedmechanism into and out of operation said means including a bell cranklever, and a cam carried by the shaft to actuate the bell crank lever toeffect the throwingin of the low speed mechanism after the high speedmechanism is thrown out.

10. A driving and stopping mechanism havin in combination, a shaft, adriving mechanism therefor, stopping devices for the shaft comprisingamember carried by the shaft and a shiftable relatively stationarymember, means under the control of the operator for shifting therelatively stationary member out of engagement with the member carriedby the shaft and for "throwing the driving mechanism into and out ofoperation,- a latch for maintainhigthe relatively statonary member outof engagement with the member carried by the shaftv when the drivingmechanism is thrown out, and means for releasing the latch at apredetermined point in the rotation of the shaft to render the stoppingdevices active.

11. A driving and stopping mechanism having, in combination, a shaft, ahigh speed driving mechanism therefor, a low speed driving mechanismtherefor, a bell crank lever, means including the bell crank lever forthrowing out the high speed mechanism, means including a bar pivotallyconnected to the bell crank lever for limiting the movement of the bellcrank lever to throw out the high speedmechanism, and means actuatedthrough the bar and bell crank lever for throwing in the low speedmechanism at a lit;

predetermined point in the rotation of the shaft and for thereafterthrowing out the low speed mechanism.

12. A driving and stopping mechanism having, in combination, a shaft, apulley driven at a high speed and a pulley driven at a low speed looselymounted thereon, a clutch member carried by the shaft and interposedbetween the pulleys and adapted to severally clutch the pulleys to theshaft, means under the control of the operator for engaging anddisengaging the high speed pulley and the clutch member, and means forengaging the low speed pulley and the clutch member when the high speedpulley is disengaged from the clutch member, and for disengaging the lowspeed pulley from the clutch member and stopping the shaft at apredetermined point in the rotation thereof.

13. A driving and stopping mechanism having, in combination, a shaft, apulley driven ata high speed, and a pulley driven at a low speed looselymounted thereon, means under the control of the operator for bringingthe high speed pulley into and out of clutching engagement with theshaft, means controlled by a cam fixed to the shaft for frictionallyclutching the low speed pulley to the shaft and for operativelydisengaging the low speed pulley and shaft, and means for stopping theshaft at a predetermined point in the rotation thereof.

14. A driving and stopping mechanism having, in combination, a shaft, ahigh speed driving mechanism therefor, a low speed driving mechanismtherefor, a lever operatively connected with the driving mechanisms,means under the control of the opera tor for actuating the lever toshift from the high to the low speed mechanisms, and automatic meansactuated through the lever for shifting the low speed mechanism out ofoperative engagement with the shaft and for stopping the shaft at apredetermined point in the rotation thereof.

15. A driving and stopping mechanism having, in combination, a shaft, apulley driven at a high speed, and a pulley driven at a low speedloosely mounted thereon, a lever operatively connected with the pulleys,means actuated through the lever for clutching the high speed pulley tothe shaft, means actuated through the lever for disconnectin the highspeed pulley from the shaft an for clutching the low speed pulley to theshaft, at a predetermined point in the rotation thereof, and meansactuated through the lever for disconnecting the low speed pulley fromthe shaft and for stopping the shaft at a predetermined point in therotation thereof.

16. A driving and stopping mechanism having, in combination, a shaft, ahigh speed driving mechanism therefor, a speed reducing mechanism forreducing the speed of the shaft when the high speed driving mechanism isthrown out, means for shifting from the high speed driving mechanism tothe speed reducing mechanism and for throwing out the speed reducingmechanism at the completion of at least a predetermined number ofdegrees of rotation of the shaft after the speed reducing mechanism isthrown in, and means for stopping the shaft in a predetermined angularposition after the speed reducing mechanism is thrown out compris ing astop disk carried by the shaft provided with an outwardly flaringperipheral recess and a spring pressed stop, arm provided with a rollfor engaging the wall of the recess and adapted to ride up on theinclined portions of the wall of the recess to permit an idle backwardand forward movement of the shaft before final stoppage of the shaft.

ROBERT H. LAWSON.

